The 75-year-old singer revealed the heartbreaking news on Instagram Saturday, sharing the last photo she and the Coton de Tuléar pooch had taken together.

“This is the last time my picture was taken with my beloved girl Samantha,” Streisand wrote. “May she rest in peace. We cherish every moment of the 14 years we had with her. May 2003 – May 2017.”

The post was met with many loving reactions from fans, who gave Streisand their support and condolences.

Samantha (“Sammie”) and Streisand had an inseparable bond, according to a source.

“Barbra was devoted to Sammie,” a source tells PEOPLE. “At home in Malibu, he followed her around wherever she went. He was truly a loving companion. Her best friend.”

Instagram is a fitting place for the Grammy winning singer to mourn Samantha’s loss. After all, Streisand’s first post (in August 2014) prominently featured the pup. “Hello Instagram… isn’t my Samantha just precious?” she wrote — captioning a shot of the two.

Since then, Streisand hasn’t needed many excuses to share pics of Samantha — whom she often called “Sammie.” From National Puppy Day to Samantha’s birthday, Streisand gave her treasured companion plenty of social media love.

Happy 14th birthday dear little Sammie.

I never need an excuse to post a photo of Sammie – look at her face! #NationalPuppyDay

Samantha even joined Streisand in the recording studio and later to help promote one of her latest tours.

Barbra & Sammie want to remind you that tickets for The Music… The Mem’ries… The Magic! go on sale tomorrow morning at 10 am local time. Every ticket purchased online includes a CD of Barbra's new album, which will be released later this year. #BarbraENCORE

The dog lived a life of luxury, traveling with Streisand and husband James Brolin on vacation. Her image was once crafted into a nearly life-size lookalike cake for Streisand.

Sammie in lace… she's such a good girl going from interview to interview with me.

A cause of death was not revealed. In October, Streisand had asked her fans to pray for the dog who was having surgery — though the icon later explained on Instagram the surgery was cancelled.

Streisand has raved about her love for Samantha in the past. In February 2013, she told the London

that Samantha often joins her and Brolin on road trips.

“She’s the most beautiful thing you’ve ever seen. She’s like the daughter I never had,” Streisand said of Samantha. “She speaks English. She understands English, I swear to God.”

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